Package org.apache.jena.graph

This package defines the Graph and Node family of classes, which form the underlying datatypes of the Jena system.

Interface Summary

Interface	Description
Capabilities	Interface for expressing capabilities.
FrontsNode	HasNode - interface for objects that front a Node in some context.
FrontsTriple	FrontsTriple (see also FrontsNode) is an interface for things that can be seen as wrappers round triples.
GetTriple	this interface describes types that can have a triple extracted using a getTriple method.
Graph	The interface to be satisfied by implementations maintaining collections of RDF triples.
GraphEventManager	The component of a graph responsible for managing events and listeners.
GraphListener	Interface for listening to graph-level update events.
GraphMaker	A factory for providing instances of named graphs with appropriate storage models.
NodeVisitor	The NodeVisitor interface is used by Node::visitWith so that an application can have type-dispatch on the class of a Node.
TransactionHandler	Preliminary interface for graphs supporting transactions.
TripleBoundary	An interface for expressing a stopping condition on triples, such as in sub-graph extraction.
TripleIterator	An extended iterator that can return its next element as a Triple.

Class Summary

Class	Description
BlankNodeId	System identifier for a blank node.
Factory	A factory class for creating Graphs.
GraphEvents	GraphEvents is the base class for Jena general graph events.
GraphExtract	GraphExtract offers a very simple recursive extraction of a subgraph with a specified root in some supergraph.
GraphUtil	An ad-hoc collection of useful code for graphs
Node	A Node has five subtypes: Node_Blank, Node_Anon, Node_URI, Node_Variable, and Node_ANY.
Node_ANY	A Node_ANY (there should be only one) is a meta-node that is used to stand for any other node in a query.
Node_Blank	RDF blank nodes, ie nodes with identity but without URIs.
Node_Concrete	This is the class of "concrete" nodes, ie those which correspond to actual RDF data - URIs, blank nodes, and literals.
Node_Ext<X>	Extension to the RDF Data model.
Node_Fluid	This is the subclass of "fluid" nodes, ie nodes that are "holes" in pattern matching.
Node_Graph	RDF Graphs as RDF terms.
Node_Literal	An RDF node holding a literal value.
Node_Triple	RDF triples as RDF terms for RDF-star embedded triples.
Node_URI	RDF nodes with a global identity given by a URI.
Node_Variable	"variable" nodes; these are outside the RDF2003 specification, but are used internally for "placeholder" nodes where blank nodes would be wrong, most specifically in Query.
Node_Variable.VariableName
NodeFactory
Triple	Triples are the basis for RDF statements; they have a subject, predicate, and object field (all nodes) and express the notion that the relationship named by the predicate holds between the subject and the object.
Triple.Field	A Field is a selector from Triples; it allows selectors to be passed around as if they were functions, hooray.

Exception Summary

Exception	Description
JenaNodeException
Node.NotLiteral	Exception thrown if a literal-access operation is attempted on a non-literal node.